Another way of getting rid of all those single ship contacts is to change the line "Decay time for opportunity radio contacts" to zero. Also change "Display range for opportunity radio contacts" to something like 300. Comsubpac will only notify you of convoys within 300 kilometers of your position, so preventing your message file from clogging up with spurious messages about convoys too far off to be of any interest to you.
Regards
Wouaou ! Ok, I will try it.
Thanks you very much, guys, for your help
